CN102324864A - Three-phase grid-connected inverter unit - Google Patents
Three-phase grid-connected inverter unit Download PDFInfo
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- CN102324864A CN102324864A CN201110286649A CN201110286649A CN102324864A CN 102324864 A CN102324864 A CN 102324864A CN 201110286649 A CN201110286649 A CN 201110286649A CN 201110286649 A CN201110286649 A CN 201110286649A CN 102324864 A CN102324864 A CN 102324864A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a three-phase grid-connected inverter unit which comprises a unit controller and three 2-unit IGBT (Insulated Gate Bipolar Translator) modules, wherein the IGBT modules are connected with the main controller through a drive and gate circuit and are connected with the DC side through a composite busbar. In the invention, a three-phase bridge arm is formed by using the three identical IGBT modules, and a standard photovoltaic three-phase grid-connected inverter unit is formed by matching unit controllers and other auxiliary devices. In photovoltaic power station applications with high-power electric energy transformation need, a high-power photovoltaic grid-connected inverter device can be formed by independently connecting a plurality of three-phase grid-connected inverter units in parallel on the grid side. By using the three-phase grid-connected inverter unit, the maintenance time of the inverter device is reduced, the cost of large-scale industrial production is reduced, the power output capacity of a photovoltaic array is improved to the maximum extent, and the control is relatively simple and direct.
Description
Technical field
The present invention relates to a kind of inverter, specifically a kind of high-power photovoltaic synchronization three-phase inversion unit that is used for single-stage DC/AC conversion belongs to the transformation of electrical energy technical field.
Background technology
Solar energy distributes extensively; Be easy to utilize for people; Utilize this cleaning of solar energy power generating, environmental protection, reproducible new-generation mode to compare with nuclear power, wind-powered electricity generation and water power; Irreplaceable original advantage is arranged, just becoming alternative energy source important in the energy resource structure, obtained the extensive attention of global various countries.China has abundant solar energy resources; Also obtained certain achievement in field of photovoltaic power generation; Each producer has developed many small-power photovoltaic combining inverters towards family expenses; But the high-power photovoltaic synchronization inverter product that is applicable to the photovoltaic plant use is less, has restricted the development of photovoltaic generation industry.
Adopt the photovoltaic combining inverter of one-level DC/AC conversion simple in structure, control has directly become the main flow topological structure of domestic and international high-power photovoltaic synchronization inverter.Photovoltaic array is as the DC source of photovoltaic DC-to-AC converter, has that the arranged in arrays area is big, monolithic photovoltaic cell component power density is lower, power output receives illumination variation to influence bigger characteristics.Therefore, for making full use of the power output capacity of each photovoltaic cell component, photovoltaic array should not be made up of through going here and there and confluxing too much monolithic photovoltaic cell component.For the present photovoltaic combining inverter that adopts one-level DC/AC conversion, all the more so.
In addition, common power electronics transformation of electrical energy device mainly adopts air-cooled radiating mode at present, and the rotation speed of fan that is used to dispel the heat can not be regulated and control, and causes lasting airborne noise easily, has also strengthened the operation energy consumption of photovoltaic DC-to-AC converter self; Simultaneously,,, fail again in time to handle, cause the electronic power switch components from being damaged easily in case temperature is too high if the temperature of electronic power switch device can not be monitored in real time.
Summary of the invention
The object of the invention just is to overcome the deficiency of above-mentioned prior art; And a kind of three-phase inversion unit that is used for high-power photovoltaic synchronization is provided; This three-phase inversion unit is equipped with the grid-connected three-phase inversion unit that cell controller and other additional device promptly constitute a standard again through three identical IGBT modules are constituted a three-phase brachium pontis.
Realize that the technical scheme that the object of the invention adopts is: a kind of three-phase grid inversion unit; Comprise cell controller and three 2 unit IGBT modules; Said IGBT module is connected with cell controller through driving and gate pole circuit, and said IGBT module is connected with DC side through composite bus bar.Comprise in the said 2 unit IGBT modules that IGBT goes up pipe unit under pipe unit and the IGBT.
Further; Said cell controller comprises that master control system, AD detect modulate circuit, digital input and output interface circuit, temperature detection and blower fan circuit for regulating and controlling, drive signal modulate circuit, protective circuit and communication interface circuit, and said master control system comprises DSP and FPGA.Wherein, said DSP is a digital signal processor, and FPGA is a field programmable gate array.
Further, said temperature detection and blower fan circuit for regulating and controlling are connected with the NTC temperature sensor, and said NTC temperature sensor is connected with described IGBT module.
Further, said composite bus bar comprises two copper coins that are arranged in insulating material, and said two copper coins go to upper and lower layer and distribute, and are provided with insulating material between two copper coins; Described two copper coins respectively are provided with two outlet terminals, and from top to bottom, first is the outlet terminal of upper strata copper coin with the 3rd terminal, and second and the 4th terminal are the outlet terminal of lower floor's copper coin.Said upper strata copper coin respectively with above-mentioned three IGBT modules in the IGBT collector electrode of going up pipe unit join, said lower floor copper coin respectively with above-mentioned three IGBT modules in IGBT under the emitter of pipe unit join,
Further; Said composite bus bar is provided with and the corresponding buffer circuit of each IGBT module; Said buffer circuit is two noninductive electric capacity of parallel connection; End after the parallel connection on composite bus bar with corresponding IGBT module in IGBT on the collector electrode crimping mutually of pipe unit, the other end on composite bus bar with corresponding IGBT module in IGBT under the emission collection crimping mutually of pipe unit.
Further; Three-phase grid inversion unit of the present invention also comprises radiator, and said three 2 unit IGBT modules are located on the spreader surface, and said radiator comprises aluminum base plate and polylith aluminum radiated rib; One end soldering of said aluminum radiated rib is on aluminum base plate; Space between adjacent aluminum radiated rib forms the air channel, and the top and the two ends of said aluminum radiated rib are provided with duct shield, and radiator afterbody air outlet is provided with blower fan.Wherein blower fan is connected with cell controller temperature detection and blower fan circuit for regulating and controlling, and temperature detection and blower fan circuit for regulating and controlling send the signal of control rotation speed of fan.
The present invention constitutes a three-phase brachium pontis with three 2 identical unit IGBT modules, is equipped with the grid-connected three-phase inversion unit of a cell controller and a standard of other additional device formation again.In the photovoltaic plant that high-power electric energy conversion demand is arranged is used,, three-phase inversion of the present invention unit can constitute powerful photovoltaic network inverter through being carried out independent parallel connection in grid side.The power grade of the grid-connected three-phase inversion of single photovoltaic plant class large power unit is positioned two kinds of 250kW and 50kW, and other power grade more than 50kW can constitute through the independent parallel connection in a plurality of such three-phase inversion unit.
The present invention forms the modularization photovoltaic parallel network reverse device of standard, reduces the maintenance time of inverter, reduces the cost of large-scale industrial production, simultaneously, can improve the power output capacity of photovoltaic array again to greatest extent, and control is also directly simple relatively.
The present invention has the following advantages:
(1) the three-phase grid inversion unit uses modularized design; With radiator, IGBT module, temperature sensor, drive circuit, buffer circuit, composite bus bar and cell controller; Concentrate and be solidified into a three-phase grid inversion unit, inversion unit uses independent air channel.Each three-phase inversion unit is controlled by the cell controller of himself automatically, also can communicate by letter with the portion net-connected controller through outer simultaneously, accepts the dispatch command of power station or electrical network and sends self operating state relevant information, realization Local or Remote monitoring function.
Adopt composite bus bar to be connected between (2) three 2 unit IGBT modules and the DC side, compact conformation, composite bus bar interlayer adopt anodal P, negative pole N to place, and each layer is drawn two binding posts, outlet terminal employing PNPN mode.Adopt this method for designing can effectively reduce the distributed inductance of composite bus bar, reduce the switch stress of electronic power switch device, prolong the working life of electronic power switch device.
(3) radiator adopts the vacuum brazing aluminum alloy radiator, and radiator self constitutes airtight air channel.Temperature detection on the cell controller and blower fan circuit for regulating and controlling are to deliver to the master control system on the cell controller again behind the frequency signal with temperature sensor signal, rotation speed of fan conversion of signals earlier.Master control system can be set the overheat protector value, the junction temperature of guaranteeing power device all the time in temperature allowed range, the normal operation of guaranteed output device; The rotating speed of blower fan can be regulated and control according to the watt level and the temperature of inversion unit simultaneously, has prolonged the useful life of blower fan, has also reduced the airborne noise and the operation energy consumption of device.
Description of drawings
Fig. 1 is the schematic diagram that is electrically connected of three-phase grid inversion unit of the present invention.
Fig. 2 is the structured flowchart of cell controller among Fig. 1.
Fig. 3 is the structural representation of composite bus bar among Fig. 1, and wherein, Fig. 3 a is that the interlayer of composite bus bar is arranged sketch map, and Fig. 3 b is that the polarity and the outlet terminal of composite bus bar arranged sketch map.
Fig. 4 is the structural representation of radiator among Fig. 1.
Fig. 5 is a three-phase grid inversion unit structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing and concrete embodiment the present invention is further described.
As shown in Figure 1; Three-phase grid inversion unit of the present invention comprises cell controller 101, three 2 unit IGBT modules 201,202,203; IGBT module 201,202,203 is connected with cell controller 101 through driving and gate pole circuit 301,302,303 respectively, and IGBT module 201,202,203 is connected with DC side through composite bus bar 501.Composite bus bar 501 is crimped with buffer circuit 401,402,403 accordingly with IGBT module 201,202,203.
As shown in Figure 2, cell controller 101 comprises that master control system, AD detect modulate circuit, digital input and output drive circuit, temperature detection and blower fan circuit for regulating and controlling, drive signal modulate circuit, protective circuit and communication interface circuit.Wherein, Master control system comprises digital signal processor DSP and on-site programmable gate array FPGA; Master control system realizes automatic operation control, status monitoring and the protection to whole parallel network reverse unit; Simultaneously come transferring status data through optical fiber communication and receive the power station or the dispatch command of electrical network, realize the Local or Remote monitoring function with outside net-connected controller 901.
The used IGBT module 201,202,203 of present embodiment adopts Infineon's the 4th generations 2 unit IGBT module; IGBT module 201,202,203 is built-in with the NTC temperature sensor, and the NTC temperature sensor is connected with the temperature detection and the blower fan circuit for regulating and controlling of cell controller 101.The present invention detects the temperature of IGBT201,202,203 modules accordingly through NTC temperature sensor 801,802,803; And send temperature information on the cell controller 101 temperature detection and blower fan circuit for regulating and controlling; By the cell controller master control system temperature is monitored in real time after treatment; If arbitrary detected temperatures surpasses predetermined temperature value, then send the control signal of turn-offing six IGBT, to guarantee the work safety of IGBT module 201,202,203.
One end of driving and gate pole circuit 301,302,303 joins through row's cable and cell controller 101, transmits the IGBT module pulse width modulation (PWM) control signal that temperature, module status signal and receiving element controller 101 send.Cell controller 101 transmits control signal to driving and gate pole circuit 301,302,303 through row's cable; Driving and 301,302,303 pairs of control signals of gate pole circuit are resolved; Produce two kinds of required pulse width modulation (PWM) drive control signal of each IGBT module, and send it to corresponding IGBT module 201,202,203.The drive signal that produces is divided into high level and two kinds of low levels, is respectively applied for to control opening or turn-offing of corresponding IGBT.When the drive signal of receiving is high level, the IGBT conducting; When the drive signal of receiving was low level, IGBT turn-offed.The realization of opening and turn-off through IGBT is controlled is carried out transformation of electrical energy to outside input power supply.
Composite bus bar 501 was used for being connected between three IGBT modules 201,202,203 and DC side, adopted composite bus bar 501 to be connected between three IGBT modules 201,202,203 and the DC side.If composite bus bar 501 designs are improper, can make IGBT module 201,202,203 produce excessive switch stress, thereby cause the IGBT device breakdown.Because when opening or turn-offing in two IGBT unit of each IGBT module; Between the anodal P of the collector electrode of the last pipe unit of IGBT and busbar, produce high pressure between the emitter of the last pipe unit of IGBT and the busbar negative pole N; Cause the damage of two IGBT unit easily, therefore buffer circuit 401,402,403 is set generates to suppress high pressure.Therefore; Composite bus bar 501 is crimped with buffer circuit 401,402,403 accordingly with IGBT module 201,202,203; Buffer circuit 401,402,403 is two noninductive electric capacity of parallel connection; End after the parallel connection on composite bus bar 501 respectively with IGBT module 201,202,203 in IGBT on the collector electrode crimping mutually of pipe unit, the other end on composite bus bar 501 respectively with corresponding IGBT module 201,202,203 in IGBT under the emission collection crimping mutually of pipe unit.
Shown in Fig. 3 a; The composite bus bar 501 of present embodiment comprises two- layer copper coin 5012,5014 and three-layer insulated material 5011,5013,5015, and copper coin 5012,5014 and insulating material 501-1,5013,501 5 stick with glue to fit fully after the agent hot pressing and alternately be formed by stacking.The collector electrode that IGBT in the superiors' copper coin 5012 and the IGBT module 201,202,203 goes up pipe unit joins; Orlop copper coin 5014 respectively with each IGBT module 201,202,203 in IGBT under the emitter of pipe unit join; This connected mode makes that the superiors' copper coin is anodal P, and the orlop copper coin is negative pole N.Every layer of copper coin 5012,5014 has two outlet terminals, amounts to four, and shown in Fig. 3 b, from top to bottom, first is the outlet terminal of the superiors' copper coin 5012 with the 3rd terminal, and second and the 4th terminal are the outlet terminal of orlop copper coin 5014.This structure and connected mode can reduce the stray inductance of composite bus bar 501, reduce the switch stress of electronic power switch device.
Blower fan 701 among the present invention is connected with the temperature detection of cell controller 101 and blower fan circuit for regulating and controlling, and cell controller 101 sends the blower fan control signal, in order to control blower fan 701 rotating speeds.The blower fan control signal is temperature integrated definite according to the power and the IGBT module 201,202,203 of inversion unit, under the situation that temperature does not transfinite, when power increases, then improves rotation speed of fan; Work as power reduction, then reduce rotation speed of fan; When power is constant, then keep current rotation speed of fan.
As shown in Figure 5; Radiator 601 of the present invention is the vacuum brazing aluminum alloy radiator; Radiator 601 is a cabinet type structure; Radiator 601 comprises aluminum base plate 6011 and the end soldering polylith aluminum radiated rib 6012 at aluminum base plate 6012, and the space that adjacent aluminum radiated rib is 6012 forms the air channel, and the blower fan of installing for radiator afterbody air outlet 701 provides the air channel.Aluminum radiated rib 6012 in the radiator 601 adopts the aluminium sheet of 2mm thickness, each spacing of fins 3mm, and aluminum base plate 6011 thickness are 15mm, wherein the sheet number of aluminum base plate 6011 length and width sizes and fin can be adjusted according to the different capacity grade.After the radiator soldering is good, again radiating surface is processed, guaranteed the fineness of installed surface, make the electronic power switch device contact with spreader surface evenly, improve heat dispersion.
Shown in Figure 5 for the integrated effect sketch map of three-phase grid inversion unit of the present invention, three 2 unit IGBT modules 201,202,203 and driving and gate pole circuit 301,302,303 are positioned at the surface of radiator 601, are fixedly mounted on the surface of radiator 601.Before the installation, evenly smear one deck high-performance heat-conducting silicone grease to reduce contact heat resistance to greatest extent in the contact position of IGBT module 202,202,203 and radiator 601.IGBT module 201,202,203 is connected with DC side through composite bus bar 501; Composite bus bar 501 is provided with and each IGBT module 201,202,203 corresponding buffer circuits; 101 of cell controllers through strutting piece be fixed on composite bus bar 501 directly over; Cell controller 101 keeps certain distance with buffer circuit, and driving and gate pole circuit 301,302,303 directly are fixedly mounted on an end of IGBT module 201,202,203.This integrated morphology has compact conformation, advantage that integrated level is high.
Claims (8)
1. three-phase grid inversion unit is characterized in that: comprise cell controller and three 2 unit IGBT modules, said IGBT module is through driving and the gate pole circuit is connected with cell controller, and said IGBT module is passed through composite bus bar and is connected with DC side.
2. three-phase grid inversion unit according to claim 1; It is characterized in that: said cell controller comprises that master control system, AD detect modulate circuit, digital input and output interface circuit, temperature detection and blower fan circuit for regulating and controlling, drive signal modulate circuit, protective circuit and communication interface circuit, and wherein said master control system comprises DSP and FPGA.
3. three-phase grid inversion unit according to claim 2 is characterized in that: said temperature detection and blower fan circuit for regulating and controlling are connected with the NTC temperature sensor, and said NTC temperature sensor is connected with described IGBT module.
4. three-phase grid inversion unit according to claim 1 is characterized in that: said composite bus bar comprises two copper coins that are arranged in insulating material, and said two copper coins go to upper and lower layer and distribute, and are provided with insulating material between two copper coins; Described two copper coins respectively are provided with two outlet terminals, and from top to bottom, first is the outlet terminal of upper strata copper coin with the 3rd terminal, and second and the 4th terminal are the outlet terminal of lower floor's copper coin.
5. three-phase grid inversion unit according to claim 4; It is characterized in that: said upper strata copper coin respectively with three IGBT modules in the IGBT collector electrode of going up pipe unit be connected, said lower floor copper coin respectively with three IGBT modules in IGBT under the emitter of pipe unit be connected.
6. three-phase grid inversion unit according to claim 5; It is characterized in that: be provided with buffer circuit accordingly between said composite bus bar and each the IGBT module; Said buffer circuit is two noninductive electric capacity of parallel connection; End after the parallel connection on composite bus bar with corresponding IGBT module in IGBT on the collector electrode crimping mutually of pipe unit, the other end on composite bus bar with corresponding IGBT module in IGBT under the emission collection crimping mutually of pipe unit.
7. according to the arbitrary described three-phase grid inversion unit of claim 1～6; It is characterized in that: also comprise radiator; Said three 2 unit IGBT modules are located on the spreader surface; Said radiator comprises aluminum base plate (6011) and polylith aluminum radiated rib (6012), and an end soldering of said aluminum radiated rib (6012) is on aluminum base plate (6011), and the space between adjacent aluminum radiated rib (6012) forms the air channel; The top of said aluminum radiated rib (6012) and two ends are provided with duct shield (6013), and radiator afterbody air outlet is provided with blower fan (701).
8. three-phase grid inversion unit according to claim 7; It is characterized in that: said blower fan (701) is connected with temperature detection and blower fan circuit for regulating and controlling, and the speed-regulating signal that blower fan (701) sends according to temperature detection and blower fan circuit for regulating and controlling is made the adjusting of different rotating speeds.
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| CN201110286649.0A CN102324864B (en) | 2011-09-23 | 2011-09-23 | Three-phase grid-connected inverter unit |
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Cited By (6)
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| CN102638054A (en) * | 2012-03-31 | 2012-08-15 | 东莞市盛扬实业有限公司 | Small-power photovoltaic grid-connected inverter control system and control method thereof |
| CN103916025A (en) * | 2013-01-07 | 2014-07-09 | 永济新时速电机电器有限责任公司 | Power conversion unit |
| CN104953491A (en) * | 2015-07-14 | 2015-09-30 | 山东蓝天电能科技有限公司 | Device and method for controlling cascaded SVG (static var generator) cooling system |
| CN105119467A (en) * | 2015-08-28 | 2015-12-02 | 洛阳中重自动化工程有限责任公司 | Multi-parallel IGBT vertical type composite busbar for explosion-proof frequency converter and method |
| CN105281582A (en) * | 2015-11-12 | 2016-01-27 | 北京能高自动化技术股份有限公司 | Closed box type water cooling photovoltaic power station and intra-box environment control method thereof |
| CN110581534A (en) * | 2018-06-11 | 2019-12-17 | 台达电子工业股份有限公司 | Temperature protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102638054A (en) * | 2012-03-31 | 2012-08-15 | 东莞市盛扬实业有限公司 | Small-power photovoltaic grid-connected inverter control system and control method thereof |
| CN103916025A (en) * | 2013-01-07 | 2014-07-09 | 永济新时速电机电器有限责任公司 | Power conversion unit |
| CN104953491A (en) * | 2015-07-14 | 2015-09-30 | 山东蓝天电能科技有限公司 | Device and method for controlling cascaded SVG (static var generator) cooling system |
| CN104953491B (en) * | 2015-07-14 | 2017-09-29 | 山东蓝天电能科技有限公司 | Chain type SVG cooling system control apparatus and method |
| CN105119467A (en) * | 2015-08-28 | 2015-12-02 | 洛阳中重自动化工程有限责任公司 | Multi-parallel IGBT vertical type composite busbar for explosion-proof frequency converter and method |
| CN105119467B (en) * | 2015-08-28 | 2018-07-17 | 洛阳中重自动化工程有限责任公司 | Multi-parallel IGBT vertical type composite busbar for explosion-proof frequency converter and method |
| CN105281582A (en) * | 2015-11-12 | 2016-01-27 | 北京能高自动化技术股份有限公司 | Closed box type water cooling photovoltaic power station and intra-box environment control method thereof |
| CN105281582B (en) * | 2015-11-12 | 2017-11-14 | 青海能高新能源有限公司 | Environment control method in closed box-type water-cooled photovoltaic plant and its case |
| CN110581534A (en) * | 2018-06-11 | 2019-12-17 | 台达电子工业股份有限公司 | Temperature protection circuit |
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| CN102324864B (en) | 2014-06-25 |
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Application publication date: 20120118 Assignee: Jiangsu Daqo Kaifan Electrical Appliance Co.,Ltd. Assignor: Wuhan New Energy Institute of Access Equipment & Technology Co.,Ltd. Contract record no.: X2020980000425 Denomination of invention: Three-phase grid-connected inverter unit Granted publication date: 20140625 License type: Exclusive License Record date: 20200303 |
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